This is most common in basement or ground floor bathrooms.

Today, I learned about household sewage and drainage systems. Because the internal piping of a toilet is designed to prevent backups into the toilet itself to avoid potentially dangerous gases from entering the house through the sewage line, the water that has been flushed from the toilet follows the drainage line back to the open drain of the shower.

Unless that main line drain gets a clog, then the water that backs up behind it will follow the path of least resistance.  Since the toilet already has standing water in it, the water naturally comes back through the shower drain.  And then all over the floor.

The picture is grim indeed.

I went outside to search for a clean-out access point (a PVC pipe that sticks out of the ground and connects to the mainline drain), which would allow access with a router, to no avail.  So I'm going the old fashioned route and using good ol' drain cleaner to get the clog out.  It's been flooded for about two days, so it must be a fairly large clog.
















I need some lye to give that clog a CHEMICAL BURN.

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